[vsnet-grb-info 16139] GRB 140206B: Continued iPTF Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17421
SUBJECT: GRB 140206B: Continued iPTF Observations
DATE:    15/02/07 09:02:26 GMT
FROM:    Leo Singer at GSFC/iPTF  <leo.p.singer at nasa.gov>

L. P. Singer (NASA/GSFC), M. M. Kasliwal (Carnegie Observatories/Princeton),
and S. B. Cenko (NASA/GSFC) report on behalf of the intermediate Palomar
Transient Factory (iPTF) collaboration:

Using the Palomar 48-inch Oschin telescope (P48) and the robotic 60-inch
telescope (P60), we have continued observing the optical transients that
we reported (Singer et al., GCN 17415) in connection with GRB 140206B
(Burns & Yu, GCN 17417). At about 20 hours after the burst, all three of
the candidates (iPTF15gz, iPTF15hb, and iPTF15gv) are still clearly
detected in host-subtracted images, despite relatively coarse 3" seeing.
They show no statistically significant fading. We therefore dismiss them
as counterparts of the GRB.